{"product_id":"oem-goodman-m4-primary-limit-switch-for-acec960403bnaa-20162907","title":"OEM Goodman M4 Primary Limit Switch for ACEC960403BNAA — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman 20162906 is a genuine OEM M4 primary limit switch for Goodman and Amana gas furnaces, including the \u003cstrong\u003eACEC960403BNAA\u003c\/strong\u003e. Mounted on the heat exchanger or near the supply plenum, this primary high-limit control continuously monitors supply-air temperature. If airflow is restricted (dirty filter, blower failure, closed registers) and temperatures climb past the rated setpoint, the switch opens to shut off the gas valve and prevent heat exchanger overheating.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: Primary auto-reset high-limit switch (M4 series)\u003c\/li\u003e\n\u003cli\u003eFunction: Opens on high supply-air temperature, auto-resets on cooldown\u003c\/li\u003e\n\u003cli\u003eTerminals: 1\/4\" quick-connect spade\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman \/ Amana \/ Daikin family\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe M4 limit is factory-calibrated to a specific trip temperature and mounting bracket profile. This \u003cstrong\u003eOEM switch\u003c\/strong\u003e guarantees the correct setpoint and fitment. Generic substitutes risk nuisance lockouts or improper protection. For a primary safety device, OEM is strongly recommended.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (1\/5)\u003c\/strong\u003e — Two spade terminals and two screws. Disconnect power and gas before servicing. If the limit trips repeatedly, diagnose airflow (filter, blower, ductwork) before assuming the switch has failed.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057164108147,"sku":"GOODMAN-97","price":14.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-acec960403bnaa-20162907","provider":"National HVAC Parts","version":"1.0","type":"link"}